Double-acting-plunger pump



Aug. 31 1926. l,`598,137

o. JACOBSEN DOUBIJE ACTING PLUNGER PUMP Filed Dec. '16 1925 2 sheets-sheet 1 l %MMW Aug. 31 1926.,

O. JACOBSEN A DOUBLE ACTING PLUNGE'R PUMP Filed Dec. 16 1925 a' sheets-sheet 2 A '/NVENTR dm/ Patented Aug. 3l, 1926.

urn-TED traan? Pe-@Ehi l flfl'- A conroian'rioiv orner/ironie JJOUBLACTIss-swsesefeiner .c

Application Vfiled Decemll er yllhei nvention `relates to pumps of the double acting plunger type and vparticularly to pumps Vfor handling acids or other `corrosive liquids, although not .limited to use in lian- 5 dling' `suolrlliquid-sf It constitutes an improvement overv the pump shown and ZAdescribedin my PatentNo 1,581,616, issued March '31, 1925, and has tor its principal objects the provision of a pump,` in Which the the number, of gasketsl required, are' reduced to a -in iniinum g, theprovision of construction Iivhich `particu larly .adapted for, use in the `han'rdlihg 'ol' corrosive liquids; `thep'rol5 visionfof a cdn'struction lin'vvhich Athe 'surface requiring fitting and machining 'or grinding is also reducedto'a mininnunfj theprev'ision ot valve ehest'and cylinder design'whi'clilis simplified andreduoed "in cost, rand the p ro ger construction involving afooinbination of corrosion 'resist-f ing materials, and a reinforcing shaft of tougher material protected thereby wherein the parts may readilyfabrioated and-ash.- sembledaiid disassembled. @ne embodiment of the invention is 'illustrated in the accent,

.panying drajvings, wherein z Figure 1A s a vertioalfsection through thev pump, partially .on thecenter line, i and partiallyonthe line l'gl ot lhg. 2. L'Fig. 2 is a planyiewv'vwith :the chamber casin'glre-f 1" 31s a vertical section -enfthey linellllof `Fig. 2. L Fig. l is a side ,eley moved. Fig.

ration., Fig.' 5 is a horizontalse'ction onthel tion onwthcklfine ot Fig.-v 52 "And Fin: 17 is a section sim Vlar touthat othfi'g. 6,

but with theiialvesremoved.A Y "l l" Y Referring to the rliaiiings, 1 is the cylin-l 4 dei'casi'ng-mounted upon the base 2, andfcarrying an air chamber casing "3, Whijchis se' cured in position by means otibolts "'(not-f shown) eXtending vthrough slotted lugs l (Fig. on the cylinder casing and through similar lugs (not shown) at the lower end of the casing 3. A two part plunger 5, 6 provided with a piston rod 7 Works in the cylinder, and is operated from the sha-ft 8 through suitable means, not shown. rfhe fluid to be pumped is supplied to the cylinder through the inlet or suction passage 9 and is discharged from the air chamber casing 3 through the outlet 10. The piston rod is parked, as indicated at 11, and a suitable 1i?. provided,

line TW- V of 61 6 is a vertical seethe pump-is designed to handle.

16, 1925. Serial No. f?5,7`=2.

The top of the cylinder' casing is cored out 1 5 separated frm eachother by the vertical f land A,above these chambersl is a horizontal ports" or Valve' openings controlled bythe' f ball checlrivalves 20, `:21, 2Q.: and 23.. Between 10 number 'of casing `parts,y and consequently, v

7'(l*`ig-.`y 85.,and-lbetiveenvthe valves'QO and-w21 A, and the balls22 and 23 is a second vertical {WallQl-Figsl 6 andl); uTheair' chamber Y casing 3 isi provided with' a bottom' fivall 26 thevalvesand 21 is'a verticalfwall (Figs/f8 and '6), which aots' as aclosure for 7 and-42)@ Similarly, communication is pro-;

Yvided' from 'the chamber carrying; the .valve 42() to Athe chamber` lll beneatlrthe valve 29.

over jthe ri-b 29 (Figty and through fthe passage 1 3() (Fig). :The ribs 31 (Figs. 1

taiiiers forthefvalves 22 and Q3:- A'irelie'f'passage32 (Figs 8, 5 and 1) is provided between the suction chamberl and theigroove-BS surrounding the piston rod?,

'so that any liquid Working along the piston'z rodis preventedromi'eaehing the packing 11,.being ivithdraivn to-ithe suction fcham! ber." The packing `is Y thus largely protected from Contact with the corrosive liquids which lmetall, such-as vsteel shatting. This lshatting andhcarried by the lcasing 3, serve as re-r -head y vthe chambers carrying `the valves20. and 21.; Communication trom the chamber carrying ll il w la) lis protected by theitubular portion 35 ofthe i forwardVplunger sectionG. and is threaded atits 'rear le`nd`,into A a* sleeve4 36;-a1lso ot ysteel which is rigid with the rear plunger section 5, the metal of such section being cast around the sleeve. A collar 37, siviveled on the shaft 7, bears against the end of the tubular por* tion 35, so that by turning the shaft, or the rear plunger section5, the tivoplunger sections are tightly clamped together. A groove 38 in the forward plunger section carries one or more piston rings 39. The plunger .section 5 is provided with a tubular .enten Sien 4o guided. in heed The operation of the pump is as followsz-As the plunger moves to the left from the position of Fig. 1, a suction is created at this time on the right side of the plunger, and liquid entering the inlet 9 to the chamber 13 liftsthe valve 21passes over the rib 27 (Fig. 7) and through the passage 28 (Figs. 2 and 7) into the passage or chamber 15 1) and thence into the cylinder.

At this time, the other inlet valve is not lifted, since it is` exposed to pressure on its upper side from the liquid which is being forced from the left hand end of the cylinder, the line of communication for applying this pressure including the passage or 'chamber 14 and the passage 30 (Fig. 2). The liquid forced from the leftside of the plunger flows upward pastthe valve 22 (Fig. .1) and into the air chamber casing 3, from which it is discharged through the outlet 8.

On the reverse movement of the plunger to the right, the liquid to the rightv of the plunger flows upward past the valve 23 (Fig. 1) into the casing 3. At the saine time, a 'suction is.` created to the left of the plunger, causing an`inflow of liquid from the inlet 9 to thev chamber 13 beneath the valv 20, which liquid vHows upward .past

Y this valve, over the rib 2.9 (Figf2) through the passage (Fig. 2) into the chamber 14 and thence into the` cylinder.

It will be noted that all of thel various passages, ports and partitions are formed inthe body of the cylinder casing 1, and that the air chamber casing is all that is necessary as a closure, and as a valve retainer, so that only a single joint and gasket is required, which' is an important consideration where corrosive liquids are to be handled. The valve construction, ports and passages are also made easily accessible by merely removing the casing 3. 'Ihe corrosion resisting compositions are very hard and difficult to machine, Vexcept by grinding,y

and the present construction, because of its simplicity, and the limited number of joints, requires a minimum of grinding or 4machining. rI`he reinforced plunger construction provides thel necessary protection for the piston rod 7, and the two part arrangement lessens the difiiculty involved in casting, and

kprovides for ready assembling and disassembling, and for the replacement of piston rings. The foregoing and other advantages incident to the construction will be readily apparent to those skilled in the art.

What I claim is 1. In combination in a pump, a cylinder casing in the form of a casting having in one side a suction chamber with two pas sages leading therefrom to the opposite ends of the cylinder, and a pair of discharge passages alsoleading from the ends of the cyl- ,f

inder, a valve seat for each of said passages, also formed in said casting, an outwardly x('ipening valve for each of said seats, and an air chamber casing having an outlet and fit ting over said passages and valves and constituting a cover plate therefor and a retainer for said valves.

2. In combination in a pump, a cylinder casing in the form of a casting havingin one side a-Ysuction chamber with two passages leading therefrom to'the opposite ends of the cylinder, -and a pair of discharge pasn y sages also leading from the ends of the cylluder, a valve seat for each of said passages, also formed in said casting, a cylinder 'head integral with said casing, an outwardly opening ball valve for each of said seats, and anair chamber casing having an outlet and fitting over said passages and Vvalves and provided with means-acting as retainers for said valves.

3. In combination in a pump, a cylinder casing in the form of a casting with an integral front head, and having in one side a suction chamber with two passages leading therefrom to the opposite ends of the cylinder, and a pair of discharge passages also leading to the ends of the cylinder, a valve O. JACGBSEN,

day of Dc- 

